move highlighter code to correct place and test.
Merge branch 'master' into dev
use statusline function for better control.
minor adjustment to inactive sections.
implement basic working tabline
extract tabline colors from the current palette.
support change filename modifier.
better handling of blank buffers.
refactor and add excludes support.
add support for detecting modified buffers.
add documentation for tabline.
since this is disabled by default, set showtabline automatically.
update readme with screenshots.
mainly for windows, where paths are case insensitive.
Merge branch 'dev'